BUPKIS
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    Variable bigintAssertionConst

    bigintAssertion: AssertionStandardSchemaSync<
        readonly [readonly ["to be a bigint", "to be a BigInt"]],
        ZodBigInt,
        never,
    > = ...

    Asserts that the subject is a BigInt value.

    expect(123n, 'to be a bigint'); // passes
    expect(123, 'to be a bigint'); // fails